{"id":"CVE-2024-20436","title":"Cisco IOS and IOS XE Software WebUI Denial of Service Vulnerability","summary":"A vulnerability in the HTTP Server feature of Cisco IOS XE Software when the Telephony Service feature is enabled could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis v…","severity":"high","cvss":8.6,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","cvssSource":"vendor","vendor":"Cisco","product":"Cisco IOS XE Software","affected":["ios_xe_software 3.9.1S","ios_xe_software 3.10.0S","ios_xe_software 3.10.1S","ios_xe_software 3.10.2S","ios_xe_software 3.11.1S","ios_xe_software 3.12.0S","ios_xe_software 3.11.2S","ios_xe_software 3.13.0S","ios_xe_software 3.10.3S","ios_xe_software 3.10.4S","ios_xe_software 3.9.2S","ios_xe_software 3.11.0S","ios_xe_software 3.10.5S","ios_xe_software 3.11.3S","ios_xe_software 3.12.1S","ios_xe_software 3.12.2S","ios_xe_software 3.13.1S","ios_xe_software 3.13.2S","ios_xe_software 3.12.3S","ios_xe_software 3.14.0S","ios_xe_software 3.15.0S","ios_xe_software 3.14.1S","ios_xe_software 3.10.6S","ios_xe_software 3.11.4S","ios_xe_software 3.14.2S","ios_xe_software 3.14.3S","ios_xe_software 3.14.4S","ios_xe_software 3.13.3S","ios_xe_software 3.15.1S","ios_xe_software 3.16.0S","ios_xe_software 3.15.2S","ios_xe_software 3.17.0S","ios_xe_software 3.17.1S","ios_xe_software 3.10.2aS","ios_xe_software 3.10.2tS","ios_xe_software 3.10.7S","ios_xe_software 3.12.4S","ios_xe_software 3.13.4S","ios_xe_software 3.16.1aS","ios_xe_software 3.16.2S"],"published":"2024-09-25","updated":"2024-09-25","sourceUpdated":"2024-09-25T16:00:00+00:00","source":"CSAF","sourceUrl":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-httpsrvr-dos-yOZThut","references":[{"url":"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-httpsrvr-dos-yOZThut"},{"url":"https://software.cisco.com"}],"tags":["csaf","vendor-advisory","cisco"],"epss":0.0086,"epssPercentile":0.57617,"ingestedAt":"2026-10-15T11:50:11.865Z","slug":"CVE-2024-20436","body":"## Overview\n\nA vulnerability in the HTTP Server feature of Cisco IOS XE Software when the Telephony Service feature is enabled could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.\r\n\r\nThis vulnerability is due to a null pointer dereference when accessing specific URLs. An attacker could exploit this vulnerability by sending crafted HTTP traffic to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, causing a DoS condition on the affected device.\r\n\r\nCisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.\r\n\r\n\r\n\r\nThis advisory is part of the September 2024 release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2024 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication [\"https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75169\"].\n\n## Vendor advisories\n\n- **cisco-sa-httpsrvr-dos-yOZThut** · Cisco · affected: Cisco IOS XE Software (215 versions) · updated 2024-09-25 · [advisory](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-httpsrvr-dos-yOZThut)\n\n**Cisco IOS XE Software HTTP Server Telephony Services Denial of Service Vulnerability**. Released 2024-09-25.\n\nAffected:\n\n- Cisco IOS XE Software 3.9.1S\n- Cisco IOS XE Software 3.10.0S\n- Cisco IOS XE Software 3.10.1S\n- Cisco IOS XE Software 3.10.2S\n- Cisco IOS XE Software 3.11.1S\n- Cisco IOS XE Software 3.12.0S\n- Cisco IOS XE Software 3.11.2S\n- Cisco IOS XE Software 3.13.0S\n- Cisco IOS XE Software 3.10.3S\n- Cisco IOS XE Software 3.10.4S\n- Cisco IOS XE Software 3.9.2S\n- Cisco IOS XE Software 3.11.0S\n- Cisco IOS XE Software 3.10.5S\n- Cisco IOS XE Software 3.11.3S\n- Cisco IOS XE Software 3.12.1S\n- Cisco IOS XE Software 3.12.2S\n- Cisco IOS XE Software 3.13.1S\n- Cisco IOS XE Software 3.13.2S\n- Cisco IOS XE Software 3.12.3S\n- Cisco IOS XE Software 3.14.0S\n- Cisco IOS XE Software 3.15.0S\n- Cisco IOS XE Software 3.14.1S\n- Cisco IOS XE Software 3.10.6S\n- Cisco IOS XE Software 3.11.4S\n- Cisco IOS XE Software 3.14.2S\n- Cisco IOS XE Software 3.14.3S\n- Cisco IOS XE Software 3.14.4S\n- Cisco IOS XE Software 3.13.3S\n- Cisco IOS XE Software 3.15.1S\n- Cisco IOS XE Software 3.16.0S\n- Cisco IOS XE Software 3.15.2S\n- Cisco IOS XE Software 3.17.0S\n- Cisco IOS XE Software 3.17.1S\n- Cisco IOS XE Software 3.10.2aS\n- Cisco IOS XE Software 3.10.2tS\n- Cisco IOS XE Software 3.10.7S\n- Cisco IOS XE Software 3.12.4S\n- Cisco IOS XE Software 3.13.4S\n- Cisco IOS XE Software 3.16.1aS\n- Cisco IOS XE Software 3.16.2S\n\n## Remediation\n\nCisco has released software updates that address this vulnerability. https://software.cisco.com","depth":"twilight","depthScore":47,"depthScoreParts":{"impact":47.3,"likelihood":0.2,"exploitation":0,"ransomware":0},"changes":[]}